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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e36e070f625ba4d83d4f898cae85f6e78241966d6e3faa661e709ce9c728452' 
  AND token = 'H5AiEyD0ZVfIOYdTzmCm0V2RfABI4axJWMM6I5r/mNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}