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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94692fc4fe3bc94191ae4ea00030512d6bf8284cc68402d320e28b94aec96bfa' 
  AND token = 'JM1oKPQLrtRqUpIyWbjpITU6ngHhQGDa4/8HYLPIPxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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