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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bc55732db138bb13e60012a0de11dd76443b8e9df15c02320872d92b0df3ff' 
  AND token = 'uu6nVcuQ2BWEXlLIlTOvVEk4PNp+k9blCmV+yVdwdrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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