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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a63b84997606a10f39a54e30ecc09163c766df50081fccec3b9b4b1635cef88' 
  AND token = '943hl+XK7BQakbtDU+QsZygMKSfIGofI9dOQzdvr6TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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