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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5406ec4611cb61b692c45c5e09ac092f9ebe9aa7addad40b08b88a577832a5e6' 
  AND token = 'spvp8nNCxBgN85tXlUrRVv3Hdim7/9cLSbYPiteWaec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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