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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7296d7effd7119c7e158ea7b9c1274990894e6e309a678dada099a9632af35' 
  AND token = '8xrETNPrFqFW6tz2AWcWCRvpvhwkufHh6zSt72kuEnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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