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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882da3158ef32fd26e6e08902afe041cce15d9d4a5828acdab65debb52a8d812' 
  AND token = 'p0epp+x3sddQ1clCse4+j6tIYDxZd/kzUcinERjIFUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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