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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fb0d1e65991596956ff66d06c8cb6810141a24a87638d5ad66d933e0fa25f6' 
  AND token = 'pDbmqJ58iVffXJ49/DeM0NYx7ia6dsSWYMp6nh4wtHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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