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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c0692acc8ac68b92b96c86e68bc6f77e04c52445a0e188bc77f2b50e406c0b' 
  AND token = 'HDDzt0knSbnEP+XK9RWPz1gTW4BxuVaerZ7fuKm5HDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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