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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed37d8d23d667b56801ff6c8e34a34591702aaae909b34e38773d471f74bacb' 
  AND token = 'CmJ9C7SUsqB02L9iOMa7/In3aq28AviO+aBnqDXdHLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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