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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4762d9c7106bf29c58b8cdbbf0eebbded681fcf4659aba056617c6a7ff0ffab5' 
  AND token = 'Jcc07MLyXWD8C/PL/2iJ1m7z7Y3sDWz/y/+BrgiYuvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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