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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5bb9bfa3cf5b3d1da9206d47df06374a061b767ca8ee13a6d760b0c14e7809' 
  AND token = 'NZFq7U/9JtdeSPVjCvCBlYCj9kDSeoxNGDMmZ7XAyoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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