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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33264b4f60546cc379c8106b41c27ed39a2df21a0632b047cfcb8d3556eb5a8' 
  AND token = '0S2i+MXSR77wOwCzFTkjxz3Ut51ksWfRv6h3s0GERfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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