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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fecffd3c21977992092c6ed1ba6c7867ac4b61628e17a96e0d96c1467cf64f7' 
  AND token = 'ZhOn/lW7IcNjxBwmI87RJGF7gpKXBSRE/4h8qWd95+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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