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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6233737338b6fb92d63bc9e7f6f2bda96f512e52cc058e703c10477b2ab28f1' 
  AND token = 'rCkSxXgaVSbEOahFWsRNVOxHDua8xt6EgSe4B/99DWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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