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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c6e8a798b16576dbe40d60bf54f76ec8e0c55224b1712f63390cab02702a65' 
  AND token = 'LTdOuPGpIPYBWC7M482ey9s/Qiy58x0PvLEI0dg1n8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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