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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b307c7c5cb492b0ec3eb413b1d5bdb347e5db5dd51bdba2af594ef29e7f23a' 
  AND token = 'RHr8mf0sYLHr5WQJaZAFj9EIuAzfh5bwCzoHERzPGJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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