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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b7305dd60eab6aaeafe6e77aee0c3b29ffca697d9a6bb40ffcd1ed6148984a' 
  AND token = 'LYJ6iTWlSexx3f7MCv21FKat0wr6kAJaQ+Gbd2MHMFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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