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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2223f7bf10dcc0a837aef3a4055879f22e9bb46cc8ed61bb9e20e52163fc42d8' 
  AND token = 'ULsNiBfSjQOW/b6BQNwsVYsoaVqk5nsoxk18L4G81ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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