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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20896675295fe1cc7b680276a425e9d134c12ffbaadee01790f21925e78302a9' 
  AND token = '+NhhxiUyPc+kWlrErtKR6LMkuPa5sBW0huFjyQ5dPvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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