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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b494ce062aafddd94bd36c749663d6b17b9f3de5b0b1c9ff6b37d5a91899dbd3' 
  AND token = 'ZDGl2I4CiEHX8ieL3eWRNS7cHfXOor5d00klOTyVm3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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