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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38008de17c21d68118820818ed21fd2228975d5bdcd38dcd47b57006945d7a29' 
  AND token = 'f4zQ9QBCxAV21vWIf7ksJu4IHEW+Mo6bBdCzLpv5hAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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