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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953c56be8a5b9a58dfba86e6315799435f0cdf1a78836c961e5693f95461b178' 
  AND token = 'b0jGQ03Ac1sp7HFniRCqnd6IV+Lrk2AWc8tyTrIglHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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