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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63560e0f3110eb229d36c19f8d17f35e8b96ae5c8de8c3ad4f9d66ca46bcae5' 
  AND token = '5Dtc8OBEYCBtQCTpQJTF2Ee7KvhgLVy2PjiPlbggc/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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