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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91176ff6247dbc68c18c0e686d3c9125439f3bba4e36d43aa1864e3a76e86166' 
  AND token = '9rVbZWQ8fN+ubs5Ur3fKGp7ao7hswfj/dIkxkcGci0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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