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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851545ba6c290e0ab2540664245400992d86cb1a9d85123142b22f5ae8ed7204' 
  AND token = '7iMkBdR1ZL4mvZUCs4wt/AlimNZIz2+x6Yz/Bun5sM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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