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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53660b5ace5ff194f38eae568f9dd87fbd1d2c487f6033f0f77ce817753cb1c' 
  AND token = '9dFd9fgo5h0st3Zzj/nNvHViPDp59K1b7g4Ao0JgHAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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