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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06c1302877285b19ca3accc81eb3f7bb912974f8ee39d9f3a2931c7ee9d4915' 
  AND token = 'O0oa9tps0PCSVemplKbsWqRxZRXINUCeQocTGkMk+ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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