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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2b3e932e080c970df5036037e09b67e3f5d854106f83c49a2197daa4bbc262' 
  AND token = 'Vb+rw2/bVdqZIHpuSSf1l7OA4tafjIadE6wp8vIBA1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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