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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545cb08c974dfa4215255c484c56844f84ccbc5e5bc81971c58af34ada59874b' 
  AND token = 'uQEikymLsOreDY/mHp/AjUeaoEGyWF5vV/+tMqy7Ts4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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