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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcb353a10a546ffccd54770f0a79300a65d957db2fb666bb3280fc92949c11d' 
  AND token = 'nro2I9PW/f5L/uTBOXP3vsy/FZUnQuyBCFGcPEqotg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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