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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42ac9b5108de6da5cb55f18ff621f5ff8945e7e835ed7170697e841a62b1c0c' 
  AND token = 's/E80YlpcBEgbq2bte3D4EU6yaGToke9SumUuqlkakU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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