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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9aaff31dd18fd6d8b93938c87ee81dc7ef5bcb2a21277433b92e8d1fdb4134' 
  AND token = 'd6Xq1uL/n5QApsyALDq883Ib/QHhOfkmKHrEhpbD+Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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