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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578d9487ff31b748cc0f5670700c2fe3e71e4e7f3964700a8a65fb392bbb40b8' 
  AND token = 'F/YmB39B4D4wGESf2zxO1KgPAiMTtGONrI0z4UwSFtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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