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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5f1bde8f7faeb2a06f0e8de0b81f0e0c1c92323aa8087a9b3773247d94103d' 
  AND token = 'ldgGVCft8mCanoll4fXgQLR0C3zi4XnVPVpb7nFkb9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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