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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d19cf22b4f920ce0db529647283321db7b92faa4c3452abb499f8769630978d' 
  AND token = 'EWG6PPWJzMc27PH9leOxnpoiVMbDBPjLmrWhOM7JBwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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