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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1186337b2009bf84854a300cb4a5b0742aa513a1d7b4ac80a65e513c03f8bf5' 
  AND token = 'N0FQHW4ZzxKt6CtY/LkJvaDIDV+HzytIi+tPvszm54Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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