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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6bcf1f7c80c41f374a048fae8804fa9028cafa87292c3a921383ee99833cc3' 
  AND token = 'GwDUuL3TmB0nHPceIV3VD596/K4Q3Um1/slycCczuos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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