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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976b4d4c603d815ebe5933cf32910c846ae5bd688c73d0878bd34cc5fedc318a' 
  AND token = 'yf4ERrgAmSsVuRHo4T2cWnVZeNCpfCZSFHtMm4a2iNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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