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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c11696c39685d100c940bf489317a9be4442ddf13e2cb80f6cc8178bf272c6' 
  AND token = 'afgsjmO34+dY5/w0mvJUvdGF0+n8P4AKudE9Ic7avx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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