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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439f52b59dbe960e447420dd023876e358e5f0ccf38f26d0b1076142bc73c34e' 
  AND token = '41qre66l547/iTyPAGfRERXpFZNbWPPinKpkqp50k9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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