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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d84aa48f1c047bc92728a3a39209beb1cfb2c59dd7a8b66a0a0c70c1f0bd45d' 
  AND token = '11SP/JStuE33eyAQUQsvoxvb35tOr/qT2Dl9yR70Z5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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