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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701538d6a37a90dab05c9380b33dd0826bf6e8399067147d1729b63a11d9b8c8' 
  AND token = 'QmIiTN8buKOlEh8LCQ5IX0OcfHzmKJ1O9MpAIqHVCa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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