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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81aba8b27a61c4e6fdb4c678d7cf25f46acb83772a341eda8e6305822d3a7fab' 
  AND token = 'BoBHAxdfmgNZCnC5Z2NF/5LSJskP0suJAO1hZGY+pGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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