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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cd8ff279ba3bafb4ef822ceab88fc4b9fa258a37ca7fd54b1867513ed5af00' 
  AND token = 'OQba14PwAiv8QlQVxo70FPRshDis/1E5Ybjdvg+IiR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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