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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9eced65fd1b637032f73b710d1fd102e7a5daecc78f71e9b7252cb44f588ad7' 
  AND token = 'VVsX1OT3txTtTjf68kX9CaZSzdVMpof1/mzTn79VrYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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