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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d3020964ffb42cab047c3b3d96716c16d85688fecdb4c5e8a2d66a4806c867' 
  AND token = 's0G0tPopaOyf75srMzu1LOo5B94PcaSKDA1khxaqsKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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