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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdf388f0b0137f80b3202c838071c842e3609bc8d5fe07c9757dd50092e5a07' 
  AND token = '1s8/u+XUfXZIIE3cE2eVFP4P/ulgajbpAbxmxpCeVb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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