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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c052469b476bf72a15da6b4a5e940001b9aa60fe49a802fa4e9003c4b76ee5' 
  AND token = 'ackgDAnIuwF0wRjR8tmANKKuFQfRQQ0abhnCDT94a6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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