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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f42859876d899eb6312070c173e2b351df0eda81a85d6d46bf7b9e2a69510d' 
  AND token = 'yvFcTXcPpdCnaFijT2rnzDell1FhJfJGsW4/YFmw93c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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