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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0197e08d5d5ec8eeb4c9fe28882c6473a08877dbb9c656ad4e03dfb1080f2cbe' 
  AND token = 'yw73e7IVFLVPCfgJnW3jiKZOPqtc4qSUQWXAMoLyVyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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