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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ceb86ff40cab9d49e8af6928a5ada5bce239742355a8f5dd022ba4d63e76709' 
  AND token = 'DQFT/VCD/ypm6E2TbUpa13HeMV0COwVvwB/6Nik3vdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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