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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803a41d87fc9b70d9b24d43b43b08d358f55ae7c7c08a9e195298ab4d5b8ef69' 
  AND token = 'ZyqfacwaquA+nS5e0B9i4PxUmaxUqc3f7CCMlM2wLdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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