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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ed80736fe7f919379cce8aa10340b045fd12aef7a144a16779be7a5b972dde' 
  AND token = 'zIRyhSBYJy+QnFiWniktHB1PHwvSMJT2F8vEOwonc0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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