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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81dd04d5fcd5a93a46790e74c39d2e66c980b0a92f08a2367778788ad6311ea' 
  AND token = 'juTnh5c5QV1fNxJfzBkVB6Jig0Vc4Qi2IrhKWtUVUZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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