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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf974f1287cfdd467008c71dd3823f316407bf5a016d297e126d8a1b37217f2' 
  AND token = 'H1bZNXdiAhNT0aBk4pFqxHkyZ0YSbWJgWBWUeaBRsHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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