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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0881c48b48c6d341b1da9479a61cd93043f787d6ec1d6a75710ef17df893f2ae' 
  AND token = 'BnpimEmH7JVymJJ0XYngXSGcl8UHg38Eg3ESd0iX9ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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