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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15aa3cdb01fe8613b4a253590d40e0f2f10bd582bb0c0c1e6b9ef334ddd944d' 
  AND token = 'E72TaudlBiM7M1LhogVbN0bAHf7mdB0OXqpZxZuSEf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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