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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d07dae340ff2301fb3b961c8ad4c2ec918e4603bc3f2378db17bcb55ff7705' 
  AND token = '51P4r1h79dGUka4J5Zq3awR9fKyopfOX+fCKqMXi8fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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