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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f1bc0e12d5e82040b49ca2d431a20c7421c286c03629c5498ceb10e7c07abc' 
  AND token = 'N8MoK7sY0iiN5+LouM7QwpfD3XdwCK9UBxR3sr3Zlts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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