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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcd634fad088fbe99e6f36e41ec878d2bbfbf3f08f8b3e5edefb0ecc0a7ecb3' 
  AND token = 'Y3MwpKCgS3lxPWdIKXc+L2u2BV9P1XokIdyxWidYBJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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