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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e03b90693e2702a009fd5e17a6508d71394d3ad185a1dc261044fba6436494d' 
  AND token = 'W5i3uUi3/SUJB2X1VpKY+hfE2cybmd/hNSVJsJkUAUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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