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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41063b839dd8427bb5781fbec5d7686f554369ebae0ed055e19af1352ab23777' 
  AND token = 'naszX8GPa21FaK/TtyUsMK/nE6z+7AH36bpUb8guNZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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